Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "molecular recognition" wg kryterium: Temat


Tytuł:
Plasmonic nanoprobes gauging the length and flexibility of α,ω-Alkanedicarboxylic acids with an optical readout
Autorzy:
Misztalewska-Turkowicz, Iwona
Kravets, Mykola
Sashuk, Volodymyr
Wydawca:
Elseiver
Cytata wydawnicza:
Sensors and Actuators B: Chemical, 2021, 343, 130083 //https://doi.org/10.1016/j.snb.2021.130083
Opis:
Discrimination of chemical homologs, compounds differing by the number of repeating units, given their similitude, is non-trivial, and therefore needs unconventional approaches. Herein, by taking advantage of the difference in length and utilizing plasmon coupling, we present the recognition of a sequence of linear saturated carboxylic diacids that occur naturally and accompany us in everyday life. The interactions between these diacids and gold nanoparticles, the surface of which is covered by cationic pillar[n]pyridinium macrocycles, produce a multilevel response, including a color that can be watched with an unaided eye. This method of recognition seems to be universal for anionic species and can be potentially extended to other sorts of molecular similarity and isomerism
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Trans-1,2-diaminocykloheksan – niezwykła kariera outsidera
Trans-1,2-diaminocyclohexane – unprecedented outsider’s career
Autorzy:
Petryk, M.
Kwit, M.
Tematy:
struktura
chiralność
konformacja
synteza asymetryczna
rozpoznanie molekularne
structure
chirality
conformation
asymmetric synthesis
molecular recognition
Pokaż więcej
Wydawca:
Polskie Towarzystwo Chemiczne
Powiązania:
https://bibliotekanauki.pl/articles/171507.pdf  Link otwiera się w nowym oknie
Opis:
An enantiopure trans-1,2-diaminocyclohexane is one of the most widely used chiral diamines in modern organic chemistry. This chiral building block, readily available from waste industrial products, emerges as a major figure in the field of asymmetric synthesis. The unique structural and conformational properties of trans-1,2-diaminocyclohexane make it very useful for the development of new synthetic strategies, taking advantage of its geometrical pre-organization. In this short article, we will highlight the utility of enantiomerically pure trans-1,2-diaminocyclohexane derivatives as broad-range chiral reagents and ligands for catalytic cycles. A brief overview of the aspects of applications in the field of molecular recognition will also be given.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie cyklodekstryn w technologii wdrukowania molekularnego
Application of cyclodextrins in molecular imprinting technology
Autorzy:
Pokajewicz, Katarzyna
Poliwoda, Anna
Wieczorek, Piotr P.
Tematy:
cyklodekstryny
polimery z nadrukiem cząsteczkowym
rozpoznanie molekularne
selektywność
cyclodextrins
molecularly imprinted polymers
molecular recognition
selectivity
Pokaż więcej
Wydawca:
Polskie Towarzystwo Chemiczne
Powiązania:
https://bibliotekanauki.pl/articles/2200556.pdf  Link otwiera się w nowym oknie
Opis:
In the last decade molecular imprinted polymers (MIP) have gained great interest in the area of selective recognition various type substances. Scientific work in this field is carried out very intensively - the methods of synthesis are modified and improved, new types of hydride materials are created, as well as new reagents for synthesis. In this case, cyclodextrins (CD) and their analogues show good molecular recognition ability for its unique physical and chemical properties and suitable cavity structure. As a result, these supramolecular ligands can perform various functions in the MIP technology, and the resulting polymeric materials are characterized by high selectivity and binding specificity (recognition) of analytes structurally matched to the MIP cavity. Of particular importance is the fact that cyclodextrins enable the imprinting not only of low-molecular-weight biologically active compounds, but also of high-molecular molecules (proteins, peptides). The numerous hydroxyl groups available in cyclodextrins are active sites that can form different types of linkages. They can be cross-linked with one another, or they can be derivatized to produce monomers that can form linear or branched networks. This article provides a detailed review of MIPs based on CD and their application in the field of separation science and analytical chemistry in recent years. The discussion is grouped according to the different role of CD in MIPs, that is, functional monomer, carrier modifier, etc.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W poszukiwaniu idealnego chromojonofora
In pursuit of ideal chromoionofore
Autorzy:
Zarzeczańska, Dorota
Wcisło, Anna
Smułka, Agata
Ossowski, Tadeusz
Tematy:
chromojonofory
chromofor
antrachinon
spektrofotometria UV-VIS
rozpoznanie molekularne
chromoionophore
chromophore
anthraquinone
UV-VIs spectroscopy
molecular recognition
Pokaż więcej
Wydawca:
Polskie Towarzystwo Chemiczne
Powiązania:
https://bibliotekanauki.pl/articles/2200576.pdf  Link otwiera się w nowym oknie
Opis:
In pursuit for new chromoionophores, it is important to know their functioning, which depends primarily on theirstructure. The structures of chromoionophores were discussed, highlighting the elements that have a significant impact on their operation, i.e. the binding and visualization of metal ion binding. Chromoionophores are composed of a binding and signaling group. Valinomycin, salinomycin and synthetic crown ethers are presented as ionophores. Using the anthraquinone as an example, the function of the chromophore system was defined and discussed. It has been shown that an element connecting the main components of the chromoionophore may also play an important role. The action of chromoionophores is directly related to their acid-base properties, which can influence both ion binding and the visualization of interactions. The examples of aminoanthraquinone derivatives show the influence of the number of groups, position in the anthraquinone ring and the order of amino groups on the basicity of chromoionophores.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective Impedimetric Chemosensing of Carcinogenic Heterocyclic Aromatic Amine in Pork by dsDNA-Mimicking Molecularly Imprinted Polymer Film-Coated Electrodes
Autorzy:
Piechowska, Joanna
Ayerdurai, Viknasvarri
Carcia-Cruz, Alvaro
D'Souza, Francis
Pietrzyk-Le, Agnieszka
Spolnik, Grzegorz
Noworyta, Krzysztof
Lisowski, Wojciech
Cieplak, Maciej
Sharma, Piyush
Borowicz, Paweł
Danikiewicz, Witold
Kutner, Wlodzimierz
Wydawca:
American Chemical Society Publications
Cytata wydawnicza:
J. Agric. Food Chem. 2021, 69, 48, 14689–14698. https://doi.org/10.1021/acs.jafc.1c05084
Opis:
Inspired by the easy intercalation of quinoxaline heterocyclic aromatic amines (HAAs) in double-stranded DNA (dsDNA), we synthesized a nucleobase-functionalized molecularly imprinted polymer (MIP) as the recognition unit of an impedimetric chemosensor for the selective determination of a 2-amino-3,7,8-trimethyl-3H-imidazo[4,5-f]quinoxaline (7,8-DiMeIQx) HAA. HAAs are generated in meat and fish processed at high temperatures. They are considered to be potent hazardous carcinogens. The MIP film was prepared by potentiodynamic electropolymerization of a pre-polymerization complex of two adenine- and one thymine-substituted bis(2,2′-bithien-5-yl)methane functional monomer molecules with one 7,8-DiMeIQx template molecule, in the presence of the 2,4,5,2′,4′,5′-hexa(thiophene-2-yl)-3,3′-bithiophene cross-linking monomer, in solution. The as-formed MIP chemosensor allowed for the selective impedimetric determination of 7,8-DiMeIQx in the 47 to 400 μM linear dynamic concentration range with a limit of detection of 15.5 μM. The chemosensor was successfully applied for 7,8-DiMeIQx determination in the pork meat extract as a proof of concept.
1) National Science Centre Poland 2) European Union’s Horizon 2020 Research and Innovation Program 3) Polish Ministry of Science and Higher Education
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Od rozpoznania molekularnego do rozdziału racemicznego metodą frakcyjnej krystalizacji soli diastereomerycznych
From molecular recognition to racemic resolution by fractional crystallization of diastereomeric salts
Autorzy:
Białońska, A.
Tematy:
rozdział racemiczny
sole diastereomeryczne
czynnik rozdzielający
zróżnicowanie diastereomeryczne
rozpoznanie molekularne
racemic resolution
diastereomeric salts
resolving agent
diastereomeric diversification
molecular recognition
Pokaż więcej
Wydawca:
Polskie Towarzystwo Chemiczne
Powiązania:
https://bibliotekanauki.pl/articles/172229.pdf  Link otwiera się w nowym oknie
Opis:
Synthesis and isolation of enantiopure compounds remains an important challenge in medicinal, pharmaceutical, alimentary as well as material chemistry. Amongst many methods leading to enantiopure compounds, formation and fractional crystallization of diastereomeric salts of an enantiopure resolving agent is the most popular one. Since its discovery many years went by, and yet it has been performed by the trial and error method. Selection of the suitable resolving agent is crucial for racemic resolution efficiency. Hence, this review is concerned with common features of crystal structures of salts, in which resolving agents, frequently used for separation of racemic acids, are involved. Among them, there are crystal structures of salts of primary, secondary and tertiary chiral amines (1-arylethylamines, ephedrine, pseudoephedrine, deoxyephedrine, chinine, chinidine, cinchonine, cinchonidine, strychnine and brucine). In most of them, cations and anions are involved in characteristic systems of hydrogen bonds leading to formation of cationic-anionic self-assemblies. In this respect, brucine and strychnine appear as unique, because presence of anions usually does not affect formation of common cationic self-assemblies stabilized by weak hydrophobic interactions. Comparison of the common structural motifs indicates different factors being crucial in molecular recognition and in diastereomeric diversification. Formation of common hydrogen bonded cationic-anionic self-assemblies plays a dominant role in molecular recognition of a given acid by most of the studied amines. In turn, formation of common cationic self-assemblies stabilized by hydrophobic interaction plays a crucial role in molecular recognition of a given acid by brucine or strychnine. Diastereomeric diversification can be realized in various ways. In extreme cases, when molecular recognition in crystals of particular diastereomeric salts is similar, diastereomeric diversification is governed by different factors, depending on factors governing molecular recognition. Hydrophobic interactions play an important role in diastereomeric diversification when molecular recognition is governed by hydrogen bonds. In turn, when molecular recognition is governed by hydrophobic interactions, different hydrogen bond systems in crystals of particular salts are responsible for their diastereomeric deversification.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The two faces of the proteins structure - Application of knowledge about intrinsically disordered proteins in rational drug design
Dwie twarze struktury przestrzennej białek – zastosowanie wiedzy o białkach samoistnie nieuporządkowanych w racjonalnym projektowaniu leków
Autorzy:
Górka, Adam
Bonarek, Piotr
Tematy:
elementy rozpoznawania molekularnego
oddziaływania białko białko
fałdowanie białek
cechy sekwencji aminokwasowej białek
molecular recognition features
protein protein interactions
protein folding
amino acid sequence properties of proteins
Pokaż więcej
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Powiązania:
https://bibliotekanauki.pl/articles/41204476.pdf  Link otwiera się w nowym oknie
Opis:
Proteins are an essential component of living cells. Proper understanding of the properties of their structure is crucial to understanding their function in nature. The proteins and their fragments may exist in four states of structure organization: ordered, molten globule, pre molten globule and random coil. The particular function of proteins depend on any one of these states or a transition between them. A significant proportion of proteins in nature is composed of a mixture of ordered and intrinsically disordered regions, that fulfil important roles in the processes like signal transduction, cell cycle regulation and many others. The standard approach for rational drug design does not work for intrinsically disordered proteins (IDPs) and requires modified strategies. Furthermore, the majority of proteins with long intrinsically disordered regions (IDRs) use short molecular recognition elements (MoRFs), which undergo transition from disorder to order state and adopt various structures in numerous protein protein interactions. These interactions are an attractive therapeutic target for the pharmaceutical industry in the process of rational drug design.
Białka są podstawowymi składnikami żywych komórek. Prawidłowe rozumienie cech ich struktury przestrzennej jest kluczowe dla zrozumienia ich funkcjonowania w organizmach żywych. Białka mogą przebywać w czterech wyróżnionych stanach organizacji struktury przestrzennej: uporządkowanym, stopionej globuli, pre-stopionej globuli i kłębka statystycznego. Funkcje białek mogą być związane z każdym tych stanów, a co ważniejsze, z przejściami pomiędzy tymi stanami. Znacząca liczba białek w przyrodzie zbudowana jest z mieszaniny rejonów uporządkowanych oraz samoistnie nieuporządkowanych, które pełnią ważne role w procesach przekazu sygnału, regulacji cyklu komórkowego i wielu innych. Standardowe podejście do racjonalnego projektowania leków nie sprawdza się w przypadku białek samoistnie nieuporządkowanych (IDPs) i wymaga zmodyfikowanej strategii postępowania. Jednym z atrakcyjnych celów terapeutycznych dla przemysłu farmaceutycznego są krótkie fragmenty łańcucha aminokwasowego pełniące funkcje elementów rozpoznawania molekularnego (MoRFs), które porządkują swoją strukturę w różnorodnych i licznych oddziaływaniach z innymi białkami. Charakterystyczną cechą MoRFs-ów jest ich częste występowanie w rejonach samoistnie nieuporządkowanych łańcucha polipeptydowego.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of fRMSDchiral for mathematical description of mutual position between stereoisomers
Autorzy:
Urniaz, Rafal Damian
Tematy:
fragment-level RMSD
chiral recognition
bioinformatics
molecular modeling
fragment-level RMSD, związki chiralne, stereoselektywność, bioinformatyka, modelowanie molekularne
Pokaż więcej
Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/748148.pdf  Link otwiera się w nowym oknie
Opis:
The ability of biological systems to recognize and distinguish between compounds is crucial for living systems. A detailed study of this mechanism seems to be an important supplement for analysis of possible contact interactions between compounds and environment. This process could be characterized by variety of descriptors respond to compounds’ structural and physicochemical properties. Usually, the measure of variation in molecule positions in the three dimensional space is realized by the Root Mean Square Deviation (RMSD) calculation. Here, the traditional concept of RMSD was readjusted as fragment-level RMSD (fRMSD) and applied for mathematical description of stereoisomers’ role in the chiral recognition process.
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies